This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A116304 #7 Jul 17 2021 01:43:45 %S A116304 8217107,8030443878983905981, %T A116304 43467818511541680701794365325328847002051, %U A116304 56532181488458319298205634674671152997944 %N A116304 Numbers k such that k*(k+6) gives the concatenation of two numbers m and m+2. %e A116304 8217107 * 8217113 = 6752089//6752091, where // denotes concatenation. %Y A116304 Cf. A116173, A116290, A116303, A116305, A116318. %K A116304 nonn,base %O A116304 1,1 %A A116304 _Giovanni Resta_, Feb 06 2006